Furnace.



F. 1. ARDNER.

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APPLICATION FILED FEB. 3. 1916.

1 ,206,077. Patented Nov.' 28, 1916'.v

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F. J. ARDNER.

FURNACE. APPLlcAUoN man FEB. a. 1916.

Patented Nov. 28, 1916.

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FRANK J'. ARDNER, 0F DETROIT, MICHIGAN.

FURNACE.

Speccation of Letters Patent.

Patented nov. 28, 1916.

Application led February 3, 1916. Serial No. 75,913.

` a citizen of the United States, residing at Detroit, county of Wayne, State of Michigan, have invented a certain new and useful Improvement in Furnaces, and declare the following to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

My invention relates to furnaces for the heat treatment of steel and objects of my improvements are to secure a continuous operation and to provide for heating the articles to a uniform temperature. I secure these objects in the apparatus illustrated inthe accompanying drawings in which- Figure 1 is an elevation partly in section of a furnace embodying my invention. Fig. 2 is a plan view of the same. Fig. 3 is a detail showing the construction of some of the parts.

I have shown the furnace as of annular form in plan, and it consists essentially of the brick dome a having conduits fm; located at spaced intervals around its periphery. Through the conduits m are projected into the furnace, or the interior of the dome a, jets of ignited material mixed with air. f

The bottom of the furnace at the otherwise open lower portion of the arch a is made up of a ring which is adapted to ro.- tate about its center, and the center of the arch a, at a predetermined rate which may be adjusted. This ring is made up of cast sections of thin material g formed so as to present annular grooves at the outer and inner edges, as shown in cross section in Fig. 1 at g. In these grooves are placed side pieces of refractory material b2 and the space between them and over the intervening flat horizontal portion of the part g is placed a brick lining. This bottom, made up of the parts and g as above described, forms an annular table.

c is an annular track concentric with the table Y) g, and d is a wheel supported in a hanger depending from said table and adapted to roll upon the track c.

i is a circular rack secured to the table b g concentric therewith.

The outer periphery of the table b g rests at intervals upon friction rollers and is supported thereby. .Y

lo is a horizontal shaft resting in bearings z. lz, and having a gear wheel y'V with its teeth engaging the teeth of the 'rack z'. The wheels support the table so that the rack i shall properly engage the wheel y'.

e indicates standards supporting the arch a. y

The shaft 7c is rotated by a motor, the speed of which may be adjusted to the requirements of the work. An electric motor of the usual construction with apparatus for adjusting its speed may be used for this purpose.

The rack z' is made up of sections, the

ends of which arejoined together, as indicated in Fig. 3, where it will be seen that there is a uniting piece g3 which joins two sections of the metal portion g of the table and also serves as an attaching piece for adjacent sections of the rack i.

n and o are openings for inserting and withdrawing the material to be heated.

The operation of the above described device is as follows: The speed of the motor is adjusted so that the table shall make an approximately complete revolution in the time that it is required to subject the articles to the heat of the furnace. The table turns, for instance, in the direction of the arrow in Fig. 2. The jets of iniiammable material have been started and regulated to produce the required heat in the furnace. The articles to be heated are inserted through the opening 0 and as they come around to the opening n they are withdrawn therethrough during which time they have acquired the proper temperature which may be accurately gaged. The time necessary to subject the articles tothe heat may be also accurately fixed so that no time is wasted by treating the articles longer than necessary.

While I haveshown a furnace of annular shape it will be understood that this is simply a preferred form.

I have shown two adjacent openings in the wall of the furnace but ofcourse if the articles were placed into and withdrawn from the furnace through the opening, it would be substantially the same thing and within my invention, that is, one of the openings n or 0 might if desired be omitted and the other opening used to perform the function which would more conveniently :sov

be performed by using the two openings as shown and described.

The jets of inflammable materialare projected into the furnace in a direction approximately parallel to the plane of the bottom and above the articley supported upon the table. The space Within the furnace is consecutive and uninterrupted so that the heat of the jets may be uniformly distributed.

Vhat I claim is:

l. A furnace for treating steel or the like, comprising a conduit of refractory material, a movable bottom for the conduit cornprising a metallic plate, refractory material covering the top surface of said plate, channeled iianges depending from the side edges of said plate, and refractory members disposed and projecting above the plate to retain said refractory material thereupon.

2. A furnacefor treating steel or the like, comprising an annular conduit of refractory material, an annular rotatable table forming the bottom for the conduit, said table consisting kof a plurality of segmental metallic plates connected at their ends, refractory material covering the top surface of said plates, channeled flanges depending from the side edges of said plates, and refractory members disposed in the channel of said iianges and projecting aboveV the plates to retain said refractory material thereupon.

In testimony whereof, I sign this specifi;

cation.

FRANK J. ARDNER..

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, 117C. 

